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Doherty power amplifier and input signal processing method thereof

A power amplifier, input signal technology, applied in the direction of amplifier, amplifier type, radio frequency amplifier, etc., can solve the problem of memory effect and propose solutions, and achieve the effect of reducing memory effect, improving linearity, and increasing saturated output power

Active Publication Date: 2019-11-26
南京国博电子股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no solution to the memory effect in the prior art

Method used

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  • Doherty power amplifier and input signal processing method thereof
  • Doherty power amplifier and input signal processing method thereof
  • Doherty power amplifier and input signal processing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Example 1. The input signal processing unit 100 of a kind of Doherty power amplifier proposed by the present invention is as figure 1 As shown, the input signal processing unit 100 includes: a power divider 2 , a first circulator 3 , a first limiter 4 , a second circulator 5 , and a second limiter 6 .

[0056] The input terminal of the input signal processing unit 100 is connected to the radio frequency input signal, the first output terminal of the input signal processing unit 100 is connected to the input terminal of the carrier amplifier 8, the second output terminal of the input signal processing unit is connected to the input terminal of the peak amplifier 7, and the input signal The control terminal of the processing unit 100 is connected to the output terminal of the control circuit 10 .

[0057] Wherein, the radio frequency input signal is input to the input signal processing unit 100 through the power divider 2; the radio frequency input signal is connected to...

Embodiment 2

[0064] Example 2. The flow process of the input signal processing method of a kind of Doherty power amplifier proposed by the present invention is as follows figure 2 As shown, further detailed description will be given below.

[0065] With the peak amplifier 7 being set in the working state of the class C amplifier, and the carrier amplifier 8 being set in the working state of the class AB amplifier as an example, the concrete steps of the input signal processing method of a kind of Doherty power amplifier proposed by the present invention are as follows:

[0066]Step S1 , input signal detection: the detection circuit 9 detects the power level of the radio frequency input signal coupled through the coupler 1 , and transmits the detection result to the control circuit 10 .

[0067] Step S2, identification and control of the small signal area: if the power level of the radio frequency input signal is less than the first threshold level, the control circuit 10 controls the inp...

Embodiment 3

[0092] Example 3. Adopt a kind of Doherty power amplifier of the input signal processing method that the present invention proposes, its output efficiency characteristic curve is as follows image 3 As shown by the solid line in , its output power characteristic curve is as follows Figure 4 shown by the solid line in . The output efficiency characteristic curve of an ideal Doherty power amplifier is as follows: image 3 As shown by the dotted line in , the output power characteristic curve is as Figure 4 shown by the dotted line in . The output efficiency characteristic curve of the prior art Doherty power amplifier is as follows image 3 As shown by the dotted line in , the output power characteristic curve is as follows Figure 4 Indicated by the dotted line in .

[0093] The output efficiency of the Doherty power amplifier adopting the input signal processing method proposed by the present invention is basically the same as that of the prior art Doherty power amplif...

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Abstract

The invention relates to a Doherty power amplifier and an input signal processing method thereof. The Doherty power amplifier comprises an amplitude limiting control unit, a peak amplifier and a carrier amplifier. The amplitude limiting control unit comprises a coupler, a detector circuit and a control circuit, and is characterized by further comprising an input signal processing unit, and the input signal processing unit comprises a power divider, a first circulator, a first amplitude limiter, a second circulator and a second amplitude limiter; wherein the input end of the input signal processing unit is connected with a radio frequency input signal, the first output end of the input signal processing unit is connected with the input end of the carrier amplifier, the second output end ofthe input signal processing unit is connected with the input end of the peak amplifier, and the control end of the input signal processing unit is connected with the output end of the control circuit.According to the input signal processing method, the saturation output power of the Doherty power amplifier can be effectively improved, and the linearity of the Doherty power amplifier is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a Doherty power amplifier and an input signal processing method thereof. Background technique [0002] Doherty power amplifier technology is a commonly used technology to improve the efficiency of power amplifiers. The basic principle of the ideal Doherty power amplifier is to amplify the signal by a parallel combination of a pair of amplifiers, in which the carrier amplifier works in class AB, and the peak amplifier works in class C, and the class C amplifier only conducts when the peak value comes. pass, the two amplifiers are connected by an input power divider and an output combiner. [0003] With the advent of 5G mobile communications, when the classic Doherty power amplifier works on broadband signals, such as 80-200MHz, and the peak-to-average ratio PAPR is 7.5-12dB, it usually sacrifices the back-off small signal efficiency to meet the linearity and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03F1/02H03F1/32H03F3/195H03F3/213
CPCH03F1/0288H03F1/32H03F3/195H03F3/213H03F2200/451
Inventor 曾瑞锋陈志勇张振东陈新宇
Owner 南京国博电子股份有限公司
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